About the Authors
Department of Biology, University of Konstanz, Konstanz, Germany
The authors have declared that no competing interests exist.
EM-T and GPS conceived and designed the experiments. EM-T, GPS, YS, CG, LL, and VT performed the experiments. EM-T, GPS, YS, and CAOS analyzed the data. EM-T, GPS, and CAOS contributed reagents/materials/analysis tools. EM-T wrote the paper.